spontaneous emission

例句：

1. 1. The scientist observed that the spontaneous emission of electrons from a cathode ray tube was responsible for the glowing effect.
   科学家观察到，从阴极射线管自发发射的电子是产生发光效果的原因。
2. 2. During the experiment, we noticed that the spontaneous emission of light from the phosphorescent material was quite strong.
   在实验过程中，我们注意到荧光材料的自发发光强度相当强。
3. 3. In the study of radioactive decay, scientists often observe spontaneous emission of radiation particles, which can beused to measure the half-life of radioactive materials.
   在放射性衰变研究中，科学家们经常观察到辐射粒子的自发发射，这可以用来测量放射性材料的半衰期。